could be a few things. was he using same tires thats on car now?? same weather conditions?? what was you shifting at??
With the mods you have mph should be 104-107 range. did you let car cool of any after you made a run?? air the fronts up to 35-40 psi for less rolloing resistance. what was your 1/8 mile times and mph?? might take you a lil time to see what will work with the car. your in the 13.5's so your close!
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